Fall in zone 8bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 97229 (Bethany, OR)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Nature Park-beaverton, OR (4 miles away).
- Average last spring frostFeb 1150% chance of a 32°F freeze after this date
- Average first fall frostDec 550% chance of a 32°F freeze by this date
- Growing season (frost-free)303 daysmedian, 32°F threshold
- USDA hardiness zone8b15 to 20°F avg. coldest night
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This week in your yard
As of Oct 18, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
No soil station with a fresh reading within 62 miles.
4-inch depth
No soil station with a fresh reading within 62 miles.
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
The latest National Weather Service 7-day forecast and any Frost Advisory or Freeze Warning for 97229 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
No soil reading near this ZIP. Typical extension timing for your region: spring March to April.
Fertilizer window
Lawn region: Pacific Northwest (west of the Cascades). Timing only; always follow the product label.
- Perennial ryegrass (cool-season): Early fall: September; Late fall: October–November; Overseeded Bermuda: Light feeding once the winter rye is established, if needed. Avoid: Summer feeding.
Plant now
- Lettuce: fall sowing Sep 26–Oct 24
- Lettuce: fall transplant Oct 10–31
- Spinach: fall sowing Oct 10–31
- Bok choy / Asian greens: fall sowing Oct 10–24
- Arugula: fall sowing Oct 10–Nov 7
- Mustard greens: fall sowing Oct 10–24
- Cilantro: fall sowing Oct 10–24
- Dill: fall sowing Oct 10–24
- Strawberry (plants): fall transplant Sep 26–Oct 24
Coming up in the next 3 weeks
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Dec 5: skip heavy pruning in the 6–8 weeks before it, because new growth may not harden off in time.
Spring-flowering shrubs are pruned right after their flowers fade, not by date. See the pruning guide.
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | Dec 26 (prior Dec) |
| 50% (the "average" last frost) | Feb 11 |
| 10% (cautious: only 1 year in 10 freezes later) | Mar 5 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Nov 11 |
| 50% (the "average" first frost) | Dec 5 |
| 90% (late: most years have frozen by now) | Jan 12 (next year) |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Mar 23 | Nov 13 |
| 32°F (freeze) | Feb 11 | Dec 5 |
| 28°F (hard freeze) | Jan 6 | Dec 21 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
Vegetable planting calendar for 97229
Dates count from your average last spring frost (Feb 11) and first fall frost (Dec 5). Half of years have a frost after the spring date, so give tender crops (tomatoes, peppers, squash) some slack.
| Crop | Start indoors | Spring planting | Fall planting |
|---|---|---|---|
| Tomato | Dec 17–31 | Feb 18–Mar 4 (transplant) | Aug 8–Sep 5 (transplant) |
| Pepper (sweet and hot) | Dec 3–17 | Feb 25–Mar 11 (transplant) | Aug 15–Sep 5 (transplant) |
| Eggplant | Dec 3–17 | Feb 25–Mar 11 (transplant) | Aug 15–Sep 5 (transplant) |
| Tomatillo | Dec 17–31 | Feb 18–Mar 4 (transplant) | – |
| Lettuce | Dec 17–31 | Jan 21–Feb 11 (transplant) Jan 14–Feb 25 (sow outdoors) | Oct 10–31 (transplant) Sep 26–Oct 24 (sowing) |
| Spinach | – | Dec 31–Jan 21 (sow outdoors) | Oct 10–31 (sowing) |
| Kale | Dec 17–31 | Jan 14–28 (transplant) Jan 14–28 (sow outdoors) | Sep 12–Oct 10 (transplant) Aug 29–Sep 26 (sowing) |
| Collards | Dec 17–31 | Jan 14–Feb 11 (transplant) Jan 14–Feb 11 (sow outdoors) | Sep 12–Oct 10 (transplant) Aug 29–Sep 26 (sowing) |
| Broccoli | Dec 3–17 | Jan 14–28 (transplant) | Aug 29–Sep 26 (transplant) |
| Cabbage | Dec 3–17 | Jan 14–28 (transplant) | Aug 29–Sep 26 (transplant) |
| Cauliflower | Dec 3–17 | Jan 28–Feb 11 (transplant) | Aug 29–Sep 26 (transplant) |
| Brussels sprouts | Nov 19–Dec 3 | Jan 14–28 (transplant) | Aug 15–Sep 5 (transplant) |
| Kohlrabi | Dec 17–31 | Jan 14–28 (transplant) Jan 14–28 (sow outdoors) | Sep 26–Oct 10 (sowing) |
| Bok choy / Asian greens | – | Jan 14–28 (sow outdoors) | Oct 10–24 (sowing) |
| Arugula | – | Jan 14–Feb 11 (sow outdoors) | Oct 10–Nov 7 (sowing) |
| Mustard greens | – | Jan 14–Feb 4 (sow outdoors) | Oct 10–24 (sowing) |
| Swiss chard | Dec 31–Jan 14 | Jan 28–Feb 18 (transplant) Jan 28–Feb 25 (sow outdoors) | Sep 26–Oct 10 (sowing) |
| Beet | – | Jan 14–Feb 11 (sow outdoors) | Sep 26–Oct 10 (sowing) |
| Carrot | – | Jan 21–Feb 18 (sow outdoors) | Sep 12–26 (sowing) |
| Radish | – | Jan 7–Feb 18 (sow outdoors) | Oct 24–Nov 7 (sowing) |
| Turnip | – | Jan 14–Feb 4 (sow outdoors) | Sep 26–Oct 10 (sowing) |
| Parsnip | – | Jan 21–Feb 11 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Dec 17–Jan 14 (sow outdoors) | Sep 12–26 (sowing) |
| Onion (bulbing) | Nov 19–Dec 3 | Dec 31–Jan 14 (transplant) | – |
| Green onion / scallion | – | Dec 31–Jan 28 (sow outdoors) | Sep 26–Oct 10 (sowing) |
| Leek | Nov 19–Dec 3 | Jan 14–28 (transplant) | – |
| Garlic | – | – | Oct 24–Nov 21 (sowing) |
| Shallot | – | Dec 31–Jan 14 (transplant) | Oct 24–Nov 21 (sowing) |
| Potato | – | Jan 14–28 (transplant) | Aug 15–29 (transplant) |
| Sweet potato | – | Mar 4–18 (transplant) | – |
| Sweet corn | – | Feb 18–Mar 4 (sow outdoors) | – |
| Bean, bush (snap) | – | Feb 18–Mar 4 (sow outdoors) | Sep 12–26 (sowing) |
| Bean, pole | – | Feb 18–Mar 4 (sow outdoors) | – |
| Lima bean | – | Feb 25–Mar 11 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Mar 4–25 (sow outdoors) | – |
| Cucumber | Jan 14–21 | Feb 18–Mar 4 (transplant) Feb 18–Mar 4 (sow outdoors) | Sep 12–26 (sowing) |
| Summer squash / zucchini | Jan 14–21 | Feb 18–Mar 4 (transplant) Feb 18–Mar 4 (sow outdoors) | Sep 12–26 (sowing) |
| Winter squash | Jan 14–21 | Feb 18–Mar 4 (transplant) Feb 18–Mar 4 (sow outdoors) | – |
| Pumpkin | – | Feb 18–Mar 4 (sow outdoors) | – |
| Watermelon | Jan 14–21 | Feb 25–Mar 11 (transplant) Feb 25–Mar 11 (sow outdoors) | – |
| Cantaloupe / muskmelon | Jan 14–21 | Feb 25–Mar 11 (transplant) Feb 25–Mar 11 (sow outdoors) | – |
| Okra | Dec 31–Jan 14 | Feb 25–Mar 11 (transplant) Feb 25–Mar 11 (sow outdoors) | – |
| Celery | Nov 19–Dec 3 | Feb 18–25 (transplant) | – |
| Basil | Dec 31–Jan 14 | Feb 18–Mar 4 (transplant) Feb 18–Mar 4 (sow outdoors) | – |
| Cilantro | – | Jan 28–Feb 25 (sow outdoors) | Oct 10–24 (sowing) |
| Parsley | Dec 3–17 | Jan 28–Feb 11 (transplant) Jan 21–Feb 11 (sow outdoors) | – |
| Dill | – | Feb 11–25 (sow outdoors) | Oct 10–24 (sowing) |
| Sunflower | – | Feb 11–25 (sow outdoors) | – |
| Asparagus (crowns) | – | Jan 14–28 (transplant) | – |
| Rhubarb (crowns) | – | Jan 14–28 (transplant) | – |
| Strawberry (plants) | – | Jan 14–28 (transplant) | Sep 26–Oct 24 (transplant) |
Typical ranges from university extension planting calendars, adjusted to your frost dates. Probabilities, not guarantees. Fall windows that would overlap spring planting are left out, as are fall crops of frost-tender plants where the frost-free season is under 210 days.
Where these numbers come from
Station: Nature Park-beaverton, OR (NOAA GHCN-Daily ID USC00355945), elevation 185 ft, 3.8 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Portland Kgw-tv, OR | 6 mi | Feb 25 | Dec 1 |
| Beaverton 2 SSW, OR | 7 mi | Apr 1 | Nov 6 |
| Portland-hillsboro AP, OR | 7 mi | Apr 16 | Oct 23 |
The average last-frost dates of these stations span 67 days, a rough guide to local variation. See data sources & methods.
Frost questions for 97229
When is the last frost in 97229?
The average (50% chance) last spring freeze of 32°F for ZIP 97229 is February 11. For a more cautious planting date, use March 5, when only 1 year in 10 still sees a later freeze.
When is the first frost in 97229?
The average first fall freeze is December 5. In 1 year in 10 it comes by November 11.
What hardiness zone is 97229?
ZIP 97229 is in USDA zone 8b (15 to 20°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 97229 right now?
This page shows the latest 2-inch and 4-inch soil temperature from the nearest public soil station (USDA SCAN, NOAA USCRN or TexMesonet), or a labeled estimate when no station is close, against the 50–55°F spring pre-emergent band.
Nearby ZIP codes
97006 Beaverton 97210 Portland 97225 Beaverton 97005 Beaverton 97003 Aloha 97203 Portland 97221 Portland 97205 Portland
Other ZIP codes in Washington County
97003 97005 97006 97007 97008 97062 97078 97106 97109 97113 97116 97117 97119 97123 97124 97125 97133 97140 97144 97223 97224 97225 All Washington County frost dates · Oregon frost dates
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Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
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Free. One weekly email plus alerts when your ZIP has a frost or a soil-temperature change worth acting on. After you submit, Kit (our email provider) sends a confirmation email: check your email and click the link to confirm. You aren't subscribed until you do. We collect only your email address and ZIP, sent to Kit to deliver The Dial. Unsubscribe anytime.